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Hi Anonymous, remove a spark plug cable leaving both plugs in head, and insert a spare spark plug ground the threads and test for spark. Also try squirting starting fluid into the induction module to see if it's fuel related. That being said you might have upset the ECM when you replaced the battery, refusing to play with the other children and need to do a reset. Please visit the websites below as they may help assist you in resolving this issue:https://answers.yahoo.com/question/index?qid=20100903124902AAsvdFY

Hi Anonymous, I need more information please tell me the year and model of your bike and exactly what your question is and can you be specific and include details like WHERE, WHEN , WHY, WHICH ONE, HOW? Thank you and have nice day.

You didn't say whether the cylinder was misfiring occasionly or not firing at all. The number of things that could cause that are quite high. From an ignition standpoint, you could have a bad coil or a bad ignition unit. From a mechanical standpoint, your compression could be low. From a fuel standpoint, you didn't say whether your engine was fuel injected or carb equipped, you might not be getting fuel to the cylinder or you might have a vacuum leak at the intake.

Check the spark first. Pull the spark plug wires off but leave the spark plugs in the heads. Install another set of plugs in the wires and lay them on the engine where you can see them. Spin the engine with the starter and watch for spark. If you have spark, is it a bright blue spark or is it a yellow looking spark? The bright blue spark is what you want.

If you have good spark, run a compression test on the engine. Screw a compression tester into the spark plug hole and open the throttle wide open. Spin the engine to test for maximum compression. Write down the reading you get. The squirt about an ounce of oil into each cylinder and run the test again. If the compression comes up more than 10%, it may be time for a top end overhaul.

Since I haven't ever heard of an FLHR-Y, I can only guess at the size of the carb. If the engine is the standard twin cam 88" engine, the carb should be a 40mm version. But, if the engine is one of the "factory hopped up jobs" such as a 103" or somthing else, I have no idea of the size of the carb.

The drain plug is on the left side of the oil reservoir pointing towards the front of the bike. The motor should be warm when you dump the oil and the o-ring should be replaced as an extra precaution (don't want to waste that new oil if you have a drip). When replacing the oil filter use a piece of tin foil to divert the oil to your waste pan.